Sahih al-Bukhari, Hadith 3771 ⓘ
Narrated Al-Qasim bin Muhammad: Once `Aisha became sick and Ibn `Abbas went to see her and said, "O mother of the believers! You are leaving for truthful fore-runners i.e. for Allah's Messenger and Abu Bakr.
حَدَّثَنِي مُحَمَّدُ بْنُ بَشَّارٍ، حَدَّثَنَا عَبْدُ الْوَهَّابِ بْنُ عَبْدِ الْمَجِيدِ، حَدَّثَنَا ابْنُ عَوْنٍ، عَنِ الْقَاسِمِ بْنِ مُحَمَّدٍ، أَنَّ عَائِشَةَ، اشْتَكَتْ، فَجَاءَ ابْنُ عَبَّاسٍ فَقَالَ يَا أُمَّ الْمُؤْمِنِينَ، تَقْدَمِينَ عَلَى فَرَطِ صِدْقٍ عَلَى رَسُولِ اللَّهِ صلى الله عليه وسلم وَعَلَى أَبِي بَكْرٍ.
also referenced under: Book 62, Hadith 118 (In-Book) & Volume 5, Book 57, Hadith 115 (USC-MSA)